[Per Overland Mail, Via Los Angeles, In Hope of the (railroad)], train illustrated cover used to Mass. 10c green (#35) tied by San Francisco Cal Sep 23 1859 postmark, all over reverse illustration of "What Cheer House" with vignettes of their facades on Sacramento Street and Leidersdorff Streets, edge at right restored, an iconic accomplishment combining advertising, propaganda and a directive on a single cover

(MWE Figure 9-11), ex Walske (Image)